# anomaly

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Related to hemivertebra: spina bifida occulta

## anomaly

1. Astronomy
a. the angle between a planet, the sun, and the previous perihelion of the planet
b. the angle between the periapsis of a particular point on a circle round the orbit as seen from the centre of the orbit. This point is obtained by producing a perpendicular to the major axis of the ellipse through the orbiting body until it reaches the circumference of the circle
c. the angle between the periapsis of an orbit and the position of an imaginary body orbiting at a constant angular speed and in the same period as the real orbiting body
2. Geology
a. a deviation from the normal value of gravity at the earth's surface, caused by density differences at depth, for example those caused by a buried mineral body
b. a magnetic field, for example one produced by a buried mineral body, that deviates from an expected or standard value, usually that of the earth's magnetic field
Anomaly

## anomaly

Any of three related angles by means of which the position, at a particular time, of a body moving in an elliptical orbit can be calculated. For a body S moving around the focus, F, of an orbit (see illustration), the true anomaly is the angle v made by the body, the focus, and the point, P, of nearest approach. For a body orbiting the Sun, P is the perihelion. The angle is measured in the direction of motion of S. If an auxiliary circle is drawn centered on the midpoint, C, of the major axis of the elliptical orbit, then the eccentric anomaly is the angle E between CS′ and CP, where S′ lies on the circle and is vertically above S. The mean anomaly is the angle M between P, F, and a hypothetical body moving at a constant angular speed equal to the mean motion of S. It is thus the product of the mean motion and the time interval since S passed P.

The eccentric and mean anomalies are related by Kepler's equation:

E e sinE = M

where e is the eccentricity of the orbit. The coordinates (x , y) of the body S can be found from the equations

x = a (cosE e )

y = a sinE √(1 – e 2)

where a is the semimajor axis of the orbit. See also equation of center; orbital elements.

## anomaly

[ə′näm·ə·lē]
(astronomy)
In celestial mechanics, the angle between the radius vector to an orbiting body from its primary (the focus of the orbital ellipse) and the line of apsides of the orbit, measured in the direction of travel, from the point of closest approach to the primary (perifocus). Also known as true anomaly.
(biology)
An abnormal deviation from the characteristic form of a group.
(geology)
A local deviation from the general geological properties of a region.
(medicine)
Any part of the body that is abnormal in its position, form, or structure.
(meteorology)
The deviation of the value of an element (especially temperature) from its mean value over some specified interval.
(oceanography)
The difference between conditions actually observed at a serial station and those that would have existed had the water all been of a given arbitrary temperature and salinity.
(science and technology)
A deviation beyond normal variations.

## anomaly

Abnormality or deviation. Pronounced "uh-nom-uh-lee," it is a favorite word among computer people when complex systems produce output that is inexplicable. See software conflict and anomaly detection.
References in periodicals archive ?
Hemivertebra resection and transpedicular instrumentation or contralateral hemiepiphysiodesis are options for surgical intervention in young children and should be performed early to prevent severe local deformities and secondary structural changes.
Kifoskolyoz ve gogus anomalileri, torasik vertebralarda fuzyon ve hemivertebra gorunumleri vardir.
Bu incelemeler oncesi yapilan direkt radyolojik incelemelerde; orta hatta kemik dansite, genislemis spinal kanal, spina bifida, lamina-larin vertikal fuzyonu, hemivertebra, skolyoz veya kifoz gibi bir cok anomali tesbit edilebilir (1).
Las radiografias anteroposterior y lateral mostraron gran cifoescoliosis derecha, agenesia de sacro y dos hemivertebras cervicales.
11) Other causes of back pain in our study were - scoliosis and congenital spinal deformities like dorsal hemivertebra.
Therefore, newborn EC patients should have spinal ultrasound and radiographs to define the individual spinal abnormalities ranging from hemivertebra to myelomeningocele.
La radiologia de Torax demostro agenesia de clavicula y anomalia de Sprengel izquierdas, deformidad de 1 y 2 costillas izquierdas; hemivertebras en transicion cervico-dorsal y entre D1-D4, vertebra en "mariposa" en D5 (Figura 2).
Anomalias radiograficas: puente en silla turca; anomalias vertebrales: hemivertebras, fusion o elongacion de los cuerpos vertebrales, defecto de estructura de las manos y los pies o radiolucides en forma de llamas en las manos y los pies 5.

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